Date: Sun, 9 Jul 2017 11:47:14 +0200 From: Stefan Ehmann <shoesoft@gmx.net> To: Johannes Lundberg <johalun0@gmail.com>, freebsd-current <freebsd-current@freebsd.org> Subject: Re: Getting PID of socket client Message-ID: <a42d8db6-675f-b021-fc50-6ef87d310623@gmx.net> In-Reply-To: <CAECmPwsD=PYqoG9EA=Wyq16hcrdbf7SQ3Owxdf%2BWSvYWazJfXA@mail.gmail.com> References: <CAECmPwsD=PYqoG9EA=Wyq16hcrdbf7SQ3Owxdf%2BWSvYWazJfXA@mail.gmail.com>
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On 09.07.2017 10:03, Johannes Lundberg wrote: > Hi > > Without altering the client code (i.e. adding sendmsg(credentials)), is > there anyway of getting the client PID (or path to binary) using the file > descriptor returned by accept() on the server side? > > Similar to Linux's getsockopt with SO_PEERCRED option. You want the LOCAL_CREDS socket option from unix(4). There's also a FreeBSD sample in the UNIX network programming book. Source is available from http://unpbook.com/src.html With the following two changes it seems to work for me: unixstrserv02.c: set LOCAL_CREDS readcred.c: disable CONTROL_LEN check $ ./unixstrserv02 PID of sender = 1001 real user ID = 1001 real group ID = 1001 effective user ID = 1001 3 groups: 0 5 920
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